/Engine/Source/Editor/UnrealEd/Public/EditorBuildUtils.h
Similar to EditorBuildTextureStreaming, but attempts to rebuild TextureStreamingData for all materials in loaded package(s).
true if any packages were dirtied in the process.
static bool EditorBuildMaterialTextureStreamingData ( [UPackage](API\Runtime\CoreUObject\UObject\UPackage) * Package )